Stock around 35-40
no it will just fail the spark plug more often
Stock raptor 250s willl make around 17-20 hp at the rear wheels.
Depends on the year a 1985 could go for $500 a 1995 $1000 and a 2005 for $2000 just depends on the year, conditon, and location dealer vs. private.
from my research 55-60mph.